Short Message Service Technical Realisation (GSM) - MO Short Message Service Transfer

MO Short Message Service Transfer

The diagram to the right depicts a simplified call flow for a successful submission of a mobile originated short message.

When the subscriber sends a short message, the handset sends the text message over the air interface to the VMSC/SGSN. Along with the actual text of the short message, the destination address of the SM and the address of the Short Message Service Centre (SMSC) are included, the latter taken from the handset's configuration stored on the SIM card.

Regardless of the air interface technology, the VMSC/SGSN invokes the MAP service package MAP_MO_FORWARD_SHORT_MESSAGE to send the text to the Interworking MSC of the Service Centre whose address was provided by the handset. This service sends the mo-ForwardSM MAP operation to the SMSC identified in the SM Submission from the handset, embedded within a Transaction Capabilities Application Part (TCAP) message, and transported over the core network using the Signalling Connection Control Part (SCCP).

The Interworking MSC of the SMSC, on receipt of the MAP mo-ForwardSM message, passes the SMS-PP Application Protocol Data Unit (APDU) containing the text message to the actual Service Centre (SC) of the SMSC for storing, and subsequent 'forwarding' (delivery) to the destination address and the SC returns an acknowledgement indicating success or failure. On receipt of this submission status from the Service Centre, the Interworking MSC will send an appropriate indication back to the VMSC/SGSN of the sending subscriber. The message submission status is then forwarded, over the air interface, to the subscriber's handset.


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